[clang] [Clang][ASTImporter] Implement AST import for CXXParenListInitExpr, SubstNonTypeTemplateParmPackExpr, PseudoObjectExpr (PR #160904)

[Balázs Kéri via cfe-commits]

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@@ -3300,6 +3300,75 @@ TEST_P(ImportExpr, ConceptNestedNonInstantiationDependentRequirement) {
              conceptDecl(has(requiresExpr(has(requiresExprBodyDecl())))));
 }
 
+TEST_P(ImportExpr, ImportSubstNonTypeTemplateParmPackExpr) {
+  MatchVerifier<Decl> Verifier;
+  const char *Code = R"(
+    template<auto ...> struct X {};
+    template<typename ...> struct Z {};
+
+    template<int ...N> struct E {
+      template<int ...M> using B = Z<X<N, M>...>;
+      template<int M1, int M2> E(B<M1, M2>);
+    };
+    using declToImport = E<1, 3>;
+  )";
+  testImport(Code, Lang_CXX20, "", Lang_CXX20, Verifier,
+             typedefNameDecl(hasName("declToImport")));
+}
+
+TEST_P(ImportExpr, ImportCXXParenListInitExpr) {
+  MatchVerifier<Decl> Verifier;
+  const char *Code = R"(
+    struct Node {
+      int val;
+      double d;
+    };
+    template <int N> struct Container {
+      Node* create() { return new Node(N, 3.14); }
+    };
+    using declToImport = Container<42>;
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balazske wrote:

Probably this can be enough instead of `Container`:
```Node* declToImport() { return new Node(2, 3.14); }```

https://github.com/llvm/llvm-project/pull/160904